range of prepared culture media plates for environmental monitoring, non-critical hygiene etc

Redipor® range of prepared media products

We provide an extensive range of Redipor® pre-poured plates and dipslides.

Petri dishes, settle plates and contact plates are available in 55mm, 90mm and 140mm.

Gamma irradiated products are also available.

All prepared media plates are manufactured within our cleanroom facility with quality checks at each stage of the process. Each batch is quarantined after filling, allowed to naturally condition, 100% inspected prior to final packing and can be stored at room temperature.

A sample from each batch is removed for final quality checks with detailed QC certificates provided.

Browse our range of poured culture media products below and contact us to discuss any bespoke formulation requirements.


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cherwell poured culture media products

Settle plates, contact plates and more: contact us to place your order

Agar Plates

Range of sizes available

Redipor® pre-poured agar plates available in 55mm, 90mm and 140mm.

Petri Dishes

Empty Petri dishes available in multiple sizes

55mm, 90mm and 140mm Petri dishes available for you to fill with your choice of prepared media

Contact Plates

For surface testing

Raised media plates for testing multiple types of surface testing and environmental monitoring use

Settle Plates

Settle Plates for environmental monitoring

A range of Redipor® settle plates for use on their own or in a SAS air sampler


Dipslides made to order

As part of our extensive Redipor® prepared culture media range, we offer a variety of dipslide options

cherwell supplies poured media to many businesses

Some of our clients



Asked Questions

What does the use by date mean on Redipor® prepared media?

For Redipor media the Use By date is the last day on which the medium should be inoculated or exposed. Any incubation period that is normal for that product may begin on that day. For example a 14 day sterility test in TSB or a 5 day incubation for a TSA settle plate.

Are there any benefits to dip slides?

Dip slides can be less sensitive than contact plates or swabs and they often have less stringent QC release criteria. However there are circumstances where they have real advantages.

They are convenient and easy to use by the relatively less skilled.
They are ideal for testing water tanks and hygiene monitoring in food preparation and similarly clean but not aseptic environments. Most importantly they are ideal for field use because they are self contained and the slide can be incubated and assessed without opening the device.

How do I melt bottled agar?

Ideally in free steam at 100°C. Alternatively in a waterbath just less than boiling.

It is not recommended to heat bottled agar in a microwave oven or on a hot plate because there is a risk of serious injury from broken glass and hot agar.

Which culture media should I use?

We can provide a great deal of information so that the user can make an informed choice. Please phone or email with details.

Why might I want gamma irradiated media?

The sterility of the packaged medium is assured and all but the outer layer of packaging is also sterile. Thus the risk to the environment to be sampled is greatly reduced. There is an additional benefit that the additional packaging and process extends the room temperature shelf life. This can be sufficient reason for small or irregular users to prefer irradiated.

What is the maximum exposure time for settle plates?

Settle plates are used to monitor the level of viable particles in the environment through a process of passive air sampling. A viable particle settles on agar plates at a rate dependent on its characteristics and the airflow in the environment.

EU GMP Guide Annex 1 has recommended that 90mm settle plates can be exposed in cleanroom environments for up to 4 hours. However, agar plates may dry out during long exposures where the rate of air exchange is high. So, it might be necessary to use deep filled settle plates, or replace the settle plate after a shorter time to ensure satisfactory growth promotion after exposure.

Is it OK to store prepared media in the fridge?

The storage condition for the majority of our prepared media is Ambient not exceeding 25ºC, the exception being a couple of very specialist products.

We have never specified storage in a fridge for our general media as this causes excessive condensation and can result in a very wet agar surface. This makes the product impossible to use.

What is the difference between general purpose and selective growth media?

General purpose media have nutrients that support the growth of most non fastidious culturable microorganisms. Selective growth media contain components that will inhibit the growth of some types of microorganisms, while supporting the growth of others.

General purpose media, such as Tryptone Soya Agar, are used to produce total counts. While selective media, such as XLD for Salmonella species, are used to test presence/absence of specific types of microorganism.

Cherwell is different

Supplying products is only the start


The best products prepared for you

Our Redipor® media products are batch tested, QC certified and delivered when you need them


Bespoke accessories and services

We provide additional equipment or services to make your environmental monitoring more effective


Best customer service

We build long-standing client relationships on understanding, commitment and trust


get our pocket guide

The Pharmaceutical and Cleanroom Industry's Guide to Prepared Culture Media

A guide to understanding the logistics, best practices and breadth of available prepared media options for varying applications.


Download Guide